/*
 *  Copyright 2013 National Institute of Advanced Industrial Science and Technology
 *  
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.sss.common.io;

import java.io.IOException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.sss.common.DataChunk;
import org.sss.common.EncodedBucket;
import org.sss.mapreduce.GroupID;
import org.sss.mapreduce.SssException;

/**
 * Write to TokyoTyrant.
 */
public class DataWriterImpl implements DataWriter {
  private static Logger logger = LoggerFactory.getLogger(DataWriterImpl.class);

  @Override
  public long write(GroupID gid, DataChunk chunk) throws SssException {
    try {
      final IOThread iot = IOThread.currentThread();
      final int sid = iot.getProcessID();
      final int tid = iot.getThreadID();
      final KeyFormatter kf = KeyFormatter.get(gid.getKeyFormat());

      if (kf != KeyFormatter.processingOrderFormatter) {
        chunk.sort();
      }

      int nbytes = 0;
      final byte[][] tmp = new byte[chunk.size()* 2][];
      logger.debug("bytes capacity {}.", tmp.length);

      int idx = 0;
      for (EncodedBucket b: chunk) {
        final long cnt = iot.getNextCount();
        byte[] key = kf.generate(gid, b.subhash, sid, tid, cnt, b.key);
        tmp[idx++] = key;
        tmp[idx++] = b.value;
        nbytes += key.length + b.value.length;
      }
      iot.getDB(chunk.getPartition()).putlist(tmp);
      return nbytes;
    }
    catch (IOException e) {
      throw new SssException(e);
    }
  }
}
